I have discussed with colleagues in other university. They said that it might be caused by the program erased in EEPROM due to no power on the FTIR for a long time. They asked me to re-transfer the program to the EEPROM again, however, I lost the floppy disk for this process. I would be appreciated if you could send me a copy of the EEPROM floppy disk for to to try.

we exchanged the FTIR to a newer model due to high servicing costs (replaced the laser 3 times, everytime signaled by the mentioned error). I still have a bunch of diskettes here but nothing that says anything about EEPROM. Additionally we don't have a PC with a floppy drive anymore.

We have finally checked that the problem is due to the failure of the KBr beam splitter. Could you sell your KBr beam splitter to us if you still keep it? Because this part discontinued, we cannot order it from Perkin Elmer anymore.

I found that it was due the broken KBr beamsplitter attacked by moisture. I have sent it to a company to grow a new KBr film on it. Now it works without this error, but now I have another problem of "Fringe amplitude too low" and "Energy too low to find centerburst" after initialization. I guess it might be caused by broken KBr detector or degraded laser or misalignment of the optics.